Many librarians were important in helping me to track down research
material for this project. I would particularly like to convey my gratitude to the
librarians at the Centre of Academic Resources, Language Institute, Faculty of Arts,
Faculty of Education, and Faculty of Communication Arts in Chulalongkorn
University, at the Main Library in Mahidol University, and at the Main
Library in Kasetsart University, who were always helpful in locating research
materials for me.